C minor (abbreviated c or Cm) is a minor scale based on C, consisting of the pitches C, D, E♭, F, G, A♭, and B♭. The harmonic minor raises the B♭ to B♮. Changes needed for the melodic and harmonic versions of the scale are written in with naturals and accidentals as necessary.

Usage

In the Baroque period, music in C minor was usually written with a two-flat key signature, and some modern editions of that repertoire retain that convention.

Of the two piano concertos that Mozart wrote in a minor key, one of them (No. 24, K. 491) is in C minor.

C minor has been associated with heroic struggle since Beethoven's time. Beethoven wrote some of his most characteristic works in the key of C minor, including the Symphony No. 5 and no fewer than three piano sonatas. (See Beethoven and C minor.)